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  #1  
Old 22nd July 2019
bill smith bill smith is offline
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Default sluggish advance weights

Ever had a case of the idle being slow to return caused by the timing be slow to retard? My ' 74 has developed this and as far as i have diagnosed for ANY type of air leak, the timing being slow is my next culprit. Inspected the unit and serviced it and replaced the center screw which had a shoulder on it that may have been dragging the cam. Still have the problem.
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Old 22nd July 2019
Tomcatt Tomcatt is offline
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Quote:
Originally Posted by bill smith View Post
Ever had a case of the idle being slow to return caused by the timing be slow to retard?
Not on a sportster but on other distributors with weights and springs centrifugal advance. If your springs have fatigued and aren't bringing the weights back into their retarded position it happens. Timing at full advance is fine but you have too much idle advance and a timing curve that starts too early and inconsistently.
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  #3  
Old 22nd July 2019
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New springs are always a good idea. Order a few pairs so you can have extras, then lube up the moving parts when you change the springs.
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Old 22nd July 2019
bill smith bill smith is offline
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As I said the timing unit has been serviced and the springs changed,twice
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Old 22nd July 2019
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Quote:
Originally Posted by bill smith View Post
Ever had a case of the idle being slow to return caused by the timing be slow to retard? My ' 74 has developed this and as far as i have diagnosed for ANY type of air leak, the timing being slow is my next culprit. Inspected the unit and serviced it and replaced the center screw which had a shoulder on it that may have been dragging the cam. Still have the problem.
Quote:
Originally Posted by bill smith View Post
As I said the timing unit has been serviced and the springs changed,twice
??? Good luck.
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Old 22nd July 2019
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An Ultima ignition won't do that.....
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Old 22nd July 2019
needspeed needspeed is offline
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The first thing that comes to mind is an air leak, but you say that you have checked for that. I don't know what carb you have. Does it have a slide that is sticking or does it have a butterfly throttle that could have a worn carb body and/or throttle shaft? Or a throttle plate that is loose or installed incorrectly? Bad throttle cable? Accelerator pump hanging up?

It seems unlikely that the problem is the advance weights though I guess it could be.

You could take the springs out and wire the weights so that they can't move outward. Rev the engine and if it is still is slow to come back to idle then you would know that it's not the advance mechanism.
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Old 22nd July 2019
The Doctor71 The Doctor71 is offline
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Quote:
Originally Posted by bill smith View Post
Ever had a case of the idle being slow to return caused by the timing be slow to retard?
Nope.

But maybe it's possible.

A few things I might look at, if it was my ride:
  • mark the position of the timing plate, then remove the timing plate. Manually operate the weights. Then manually operate the breaker cam.

    In each case, do the weights easily & FULLY open / close ? Does the breaker cam easily follow the movement of the weights ? And vice versa ?

    If those check out ok, then I'd have another look at:

  • intake manifold leak ? (yeah I know you said you checked that)
  • sticky throttle shutter in the Bendix carb ? or throttle shutter otherwise slow to close ? (I assume you're running the stock Bendix/Zenith on a '74)
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Old 22nd July 2019
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I'd also check for air leaks at the throttle shaft and choke shaft.
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Old 22nd July 2019
bill smith bill smith is offline
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did all that a couple times, this has a dc linkert on it and the shaft is good and the throttle is closing as it should. I can easily check it while riding and the throttle is not slow to close. And no the throttle body is not cracked due to the lower stud being turned in too far. I have checked the intake with air pressure while the valves are backed off and squirting soapy water all over the manifold. Even went so far as to tape up the joint between the manifold and carb body. All the body plugs are tight. This carb has always been a good performer.
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